Poweradd Surface Pro 3 Keyboard Case Detachable Bluetooth Keyboard with Touch Pad for Microsoft Surface Pro 3 12 Inch Tablet - Updated Black Detachable Bluetooth keyboard with Touch Pad perfectly designed for Microsoft Surface Pro 3. (NOT FOR Surface 3) Buit-in premium lithium rechargeable battery provides up to 100 hours continual working time and more than 100 days standby time. Bluetooth 3.0 ABS keyboard seamlessly works with Surface Pro 3 for up to 33 feet working distance. The keyboard will automatically enter sleep mode after 15 minutes of inactivity for saving energy effectively. Ultrathin and lightweight keyboard makes it easy to carry on the go.